Validation of measurement comparability of NaI(Tl) scintillation detectors for radioactive cesium in brown rice sample b
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Validation of measurement comparability of NaI(Tl) scintillation detectors for radioactive cesium in brown rice sample by interlaboratory comparison Tsutomu Miura1 · Mayumi Hachinohe2 · Akira Yunoki1 · Shioka Hamamatsu2 · Yasuhiro Unno1 Received: 18 June 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The interlaboratory comparison that 148 laboratories participated was performed to understand the validity and variability of measurements with NaI(Tl) scintillation detectors for samples near the standard limit for radioactive cesium in general foods in Japan. Brown rice grains with certified massic activity of radioactive cesium were used as test samples. The medians of the reported massic activities of radioactive cesium, 134Cs, and 137Cs in brown rice grains agreed with the reference values. On the point of view for inspection, more than 92% of the reported values were within the acceptable range. Keywords NaI(Tl) scintillation detector · Brown rice grain · Interlaboratory comparison · Standard limit for radioactive cesium · Accident at the Fukushima Daiichi nuclear power plant
Introduction Massive amounts of radioactive nuclides were spread across eastern Japan following the accident at the Fukushima dai‑ ichi nuclear power plant in March 2011 [1–4]. To investigate contamination by radioactive nuclides released in 2011 and ensure food safety, radioactive nuclides are continuously measured in various samples such as environmental sam‑ ples and foods [5, 6]. Japanese government set provisional regulation values to regulate radionuclides in foods from 17 to 2011 [7]. In response to strong public concern about radioactive cesium contamination in general foods result‑ ing from the nuclear accident, the Japanese government has decided to conduct a food inspection of radioactive cesium based on the limit [8]. To cope with this unexpected increase in the number of food inspection compared to the situation before the accident, the laboratories that had no experi‑ ence in measuring radioactive cesium have also performed
* Tsutomu Miura [email protected] 1
National Metrology Institute of Japan, AIST, Tsukuba Central 3, 1‑1‑1 Umezono, Tsukuba, Ibaraki 305‑8563, Japan
Food Research Institute, National Agriculture Research Organization, 2‑1‑12 Kannondai, Tsukuba, Ibaraki, Japan
2
radioactive cesium measurement. On the other hand, that of laboratories had concern how to evaluate the measurement capability and quality for radioactive cesium in food. Assess‑ ment of human risk and food safety should be based on reli‑ able measurement and analysis of radioactive nuclides [9]. However, there are some concerns that the quality of measurement cannot be maintained because of the rapid increase in new laboratories resulting from a strong social interest after the earthquake. A certified reference material (CRM) and interlaboratory comparison are useful for estab‑ lishing a measurement quality on inspection system in food markets [10–12]. We have provided a CRM and performed interlaboratory comparison to enable
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